package cn.tedu.boot2.controller;

import cn.tedu.boot2.entity.Product;
import cn.tedu.boot2.utils.DBUtil;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

@RestController
public class ProductController {

    @RequestMapping("/insert")
    public String insert(Product product){
        System.out.println("product = " + product);

        try(Connection conn = DBUtil.getConnection()){
            String sql = "INSERT INTO product VALUE(NULL,?,?,?);";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1, product.getTitle());
            ps.setDouble(2,product.getPrice());
            ps.setInt(3,product.getNum());

            ps.executeUpdate();

        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "添加完成！";
    }

    @RequestMapping("/select")
    public String select(){
        List<Product> list = new ArrayList<>();
        List<Product> list2 = new LinkedList<>();

        try(Connection conn = DBUtil.getConnection()){
            String sql = "SELECT id,title,price,num FROM product;";
            PreparedStatement ps = conn.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
            while(rs.next()){
                Product p = new Product(rs.getInt("id"),
                        rs.getString("title"),
                        rs.getDouble("price"),
                        rs.getInt("num"));

                list.add(p);
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }

        String html = "<table border='1'>";
        html += "<caption>商品列表</caption>";
        html += "<tr><th>id</th><th>标题</th><th>价格</th><th>库存</th><th>操作</th></tr>";
        for(Product p : list){
            html += "<tr>";
            html += "<td>"+p.getId()+"</td>";
            html += "<td>"+p.getTitle()+"</td>";
            html += "<td>"+p.getPrice()+"</td>";
            html += "<td>"+p.getNum()+"</td>";
            html += "<td><a href='/delete?id="+p.getId()+"'>删除</a></td>";
            html += "</tr>";
        }
        html += "</table>";
        return html;
    }

    @RequestMapping("/delete")
    public String delete(int id){
        System.out.println("id = " + id);

        try(Connection conn = DBUtil.getConnection()){
            String sql = "DELETE FROM product WHERE id=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setInt(1,id);
            ps.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "删除成功！<a href='/select'>返回列表页面</a>";
    }

    @RequestMapping("/update")
    public String update(Product product){
        System.out.println("product = " + product);

        try(Connection conn = DBUtil.getConnection()){
            String sql = "UPDATE product SET title=?,price=?,num=? WHERE id=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,product.getTitle());
            ps.setDouble(2,product.getPrice());
            ps.setInt(3,product.getNum());
            ps.setInt(4,product.getId());

            ps.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }

        return "修改成功！<a href='/select'>返回列表页面</a>";
    }

}
